Warp prevention in boards or panels



Oct. 25, 1927. 1,646,906

E. FREUND WARP PREVENTION IN BOARDS OR PANELS Filed April 19. l926 BY I ATTO V Patented Oct. 25, 1927.

UNITED STATES EDWARD FREUND, OF NEW YORK, N. Y.

WARP PREVENTION IN BOARDS OR PANELS.

Application filed April 19,

My invention relates to a method and means for preventing the warping of wood boards, panels, etc. as usedin cabinet work, doors, wainscoting, partitions and flooring. Various methods have heretofore been employed involving the use of reenforcing ribs of wood or metal, but all such methods required considerable time and care, making the work expensive, and in the simple and inexpensive methods involving the use of reenforcing ribs pinned to the board, the pin= ning was ineffective in thatthe tendency of the wood to warp would cause it to pull away from or start the pinning and gradually so loosen the reenforcing rib as to render it entirely ineffective.

The improved method of my invention consists in grooving one side of the board or panel, inserting perforated metal reenforcing strips edgewise into such grooves, and securing such strips by pins or screws driven horizontally, or nearly so, into the board or panel, that is to say, the pins are driven between the major surfaces of the board or panel as distinguished from being driven through or normal to such surfaces. To facilitate the driving of the pins in this manner, the board or panel is gouged along the grooves adjacent to the perforations in the reenforcing strips. These reenforcing stirps may he made in various forms, with or without lateral stiffening wings, and such wings may be perforated for pinning.

My invention is illustrated in the accompanying drawings, in which Figure'l is a plan view illustrating a board, either onepiece, veneered or laminated, having cross slots and metal reenforcing pieces; Figure 2 a longitudinal vertical section on the line E2-2 of Figure 1; Figure 3 a side elevation of the metal strip employed as the reenforcing strip or rib in Figure 1; Figure 3 a top edge view of the piece shown in Figure 3; Figures -1- and P are enlarged top and end views of the cross-block or stiffening wing employed with the metal rib of Figure 3; Figure 5 a plan view illustrating a modifiled form of reenforcing rib; Figure 6 a vertical section on the line 6-6 of Figure 5 and Figures 7 and 8 are perspective views of two additional forms of reenforcing ribs.

Referring to the drawings, and more particularly to Figures 1 and 2, a represents a board, either solid, laminated, veneered, jointed, inlaid, or any other piece of wood,

1926. Serial N0. 103,047.

which it is desired to hold against warping, and intended especially for panels in cabi-i nets or other furniture, doors, partitions, wainscoting, or for flooring or any class of wood work, such as table tops, etc. Such boards or panels according to my invention are slotted crosswise on the under or unexposed side, as shown at Y), and into these slots are inserted, edgewise and closely fitting, metal strips or ribs 0. These. ribs are secured in place by pins (Z driven through holes 6, and for this purpose the board is gouged on opposite sides of the metal strip as shown at f, the pins being preferably driven from opposite sides of the strip, and in a plane parallel, or nearly so, to the surfaces of the board. This method of using a metal strip and pinning insures a much greater de ree of rigidity to the board against warping t 'lan metal or other strips laid flat and pinned by vertically driven pins; first, because the edgewise setting of the strip will resist the bending or warping of the wood to a far greater degree; and second, the tendency of the wood to bend or warp cannot start or pull away from the pinning as would be the case if vertically driven pins were employed.

. The metal ribs may be further secured by employing cross-pieces or wings g, which are secured to the board a by pins or screws h. One form-of wing g is shown in Figures 1, 2 and 4:, and in this form the longitudinal sides of the wings are bevelled to fit dovetailed slots 2' in ribs 0, shown more clearly in Figure 8. These wings, if desired, instead of being separable from ribs 0, may be made in other shapes and integral with ribs 0 as by brazing or otherwise.

In Figures 5 and 6 the metal reenforcing ribs are provided with lateral projections or fins g, preferably formed integral therewith, and projecting at right angles from both sides of the rib The upper edges of these fins are flush with the top edge of the rib and the under edge is preferably an arc of a circle, or approximately so, meeting with the bottom or inner edge of the rib, and provided with holes for pins d as in Figure 1, but in this form, the pins project parallel to the ribs between the upper and lower surfaces of the board. For this form of reenforcing rib the board is grooved crosswise as in the arrangement of Figure 1, but gouges f are also cut crosswise of the board, or parallel with grooves Z) instead of peri In using this form of reenforcing rib the pendicular thereto. In this form pins 03 perform the functions of both pinsd and h of Figure 1. V e I a I f In Figures 7 and 8 are shown two similar forms of reenforcing ribs made from flexible strip metal, punched with pin-holes and cut-outs, and bent into T or L-shape cross.- section; In this form the vertical sections 0 of the reenforcing rib'are-bent close to gether, and pin-holes e in the two halves of sectioned are punched'so as to register;

' board is grooved and provided with gouges I adjacent to the perforations. in the metal f per-pendi'cularand adjacent tothepin-holes ve as-in Figure 1. The lateral or wing -members g of ribs '0 take the place of wings-g of Figure 1," and are provided with pin-holes for-pinsh. In this formaof reenforcing'rib the wingsfior fiangesg' add greatly" to the rigidity of the rib. Flanges g are. provided with cut-outs leinalignment with pin holes eso thatwhen the ribs are bent into form, the cut-outs willbe over'the pin-holes and will register with gouges f in the board to permit driving the'pins d.

In employing either of the forms shown of the pins.

strip, and pinning the strips in position by pinsdriven normal to the broad-sides of the strips.

2. The method of preventing warping ofboardsor panels, consisting in grooving the board, inserting edgewise lnto such grooves perforated metal strips having lateral projections also perforated, gouging the board adjacent to the perforations in the metal strips, and pinning the strips in position by pins driven normal to the broad-sides of the strips, and also driving pins through said lateral projections,

The combination-with a board or panel to protect same against warping, of one or more ineta llic ribs adapted to be inserted edgewise into grooves in'sueh boarder panel,

'each such rib havingspaced perforations throughout ltS length for pins to be driven normal to the broad-sides of such ribs and between the major surfaces of the board or panel, and'cavities adjacent the grooves and rib perforations for facilitatmg the driving 4. The combination with a board or panel to protect same against warping, of oneor more metallic ribs adapted to be inserted edgewise into grooves in such board or panel, each such rib having spaced perforations throughout its length, lateral projections on said'ribshaving perforations for pins, cavities adjacent the grooves and rib perforations, and pins driven through the rib perforations normal to the broad-sides of the rib and between the major surfaces of'the board or panel.

This specification signed at New York city,in the county and State of New York this 8th of April, 1926.

I 1 EDWARD FREUND. 

